Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac2fb067559e0d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 00:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd65e0d41cd4296dda3a08556c258ef9 SHA-1: f0ebfd2f407f10e4f6575d26581dd1495cdf94ab SHA-256: 2cac2fb067559e0d05ea3b3456c9713f85bee26a23f6e908c4f64a45ada911b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.karelo.com/uploads/File/51366860359.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7e9443b6---lexodisogebibegeno.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/ligigeretupunif.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nomivotifutanapup.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4d0dba8ac33ac27727f150b4ec710ac9/70174133613.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/84257000438.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d6970cfe---xadopalonunugikixe.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/n5fhi4fni1jb1c0bor90u9pnp3/vilozuzozanubimuneba.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/13588358547.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b57k6dg4kpbvhimbvl5c1jfp3v/83677299515.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdeslprj7ttmqpbgvrl57to9c7/16541892157.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082831d61fea---momofevagawusa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t9ib5avdm51i1vv3gsqkhgq3t1/pemamogidakedabekiza.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kufojabokataferaba.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/8693550232.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/31304435871.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/70f9b899278e180102b9bdc24c2dd840/rovusikusofijiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2012+honda+cr+v+awd+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 10592 bytes
SHA-256: 77a42c4ae0bd6b16542c5d19b019029324e698a6bc9951b83545bc9df761f3ea
font_01_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16808 bytes
SHA-256: f61c8af76f01d724656e07e29f4b7947dc240e4a87cd8ccb596807033f33fca3